Once this has been implemented, something worse can be implemented.

I don’t like these slippery slope arguments. You might as well reduce it to any legislation.
Once people are allowed to make laws, bad people can make bad laws.
Which is why we must continue to vote in the right people, not abandon the concept of laws.

In this case, I don’t doubt that copyright infringement and general censorship are on some people’s agenda.
But this current proposal is bad enough itself and should be opposed because of that and not because someone might make other, even worse proposals in the future.